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            <h2 class="toc-title">目录</h2>
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        </div><article class="page single"><h1 class="single-title animated flipInX">06_springmvc_validator</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>山脚下的脚下山</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/spring/"><i class="far fa-folder fa-fw"></i>spring</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2016-11-01">2016-11-01</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 1640 字&nbsp;
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                <div class="details-content toc-content" id="toc-content-static"><nav id="TableOfContents">
  <ul>
    <li><a href="#1bean-validator">1、Bean Validator</a></li>
    <li><a href="#2hibernate-validator编程式校验">2、Hibernate Validator编程式校验</a>
      <ul>
        <li><a href="#21普通对象校验">2.1、普通对象校验</a></li>
        <li><a href="#22分组校验">2.2、分组校验</a></li>
      </ul>
    </li>
    <li><a href="#handlermethodargumentresolver">HandlerMethodArgumentResolver</a>
      <ul>
        <li><a href="#validateifapplicable"><strong>validateIfApplicable</strong></a></li>
      </ul>
    </li>
    <li><a href="#validationautoconfiguration">ValidationAutoConfiguration</a></li>
  </ul>
</nav></div>
            </div><div class="content" id="content"><h1 id="参数校验器">参数校验器</h1>
<blockquote>
<p>Spring MVC中的参数校验器并没有自己大量从新开发，而是使用了Hibernate-Validator，而Hibernate-Validator实现了JSR-303的所有功能。在SpringMVC中有两个地方可以于用参数校验。</p>
</blockquote>
<h2 id="1bean-validator">1、Bean Validator</h2>
<blockquote>
<p>此处的Bean Validator指JSR-303（JSR是Java Specification Requests的缩写，意思是Java 规范提案，其中303号内容指提供一套基于注解的校验规范[This JSR will define a meta-data model and API for JavaBeanTM validation based on annotations, with overrides and extended meta-data through the use of XML validation descriptors.]）。Hibernate Validator是它最出名的实现，也是目前世界上使用最广的校验器实现。Hibernate Validator 提供了 JSR 303 规范中所有内置 constraint 的实现，除此之外还有一些附加的 constraint。</p>
</blockquote>
<table>
<thead>
<tr>
<th>Annotation</th>
<th>注解说明</th>
<th>备注</th>
</tr>
</thead>
<tbody>
<tr>
<td>DecimalMax</td>
<td>元素必须是一个数字，其值必须小于或等于指定的最大值</td>
<td></td>
</tr>
<tr>
<td>DecimalMin</td>
<td>元素必须是一个数字，其值必须大于或等于指定的最小值</td>
<td></td>
</tr>
<tr>
<td>Pattern</td>
<td>必须与指定的正则表达式匹配</td>
<td></td>
</tr>
<tr>
<td>Email</td>
<td>检查给定的字符序列（例如字符串）是否是格式正确的电子邮件地址</td>
<td></td>
</tr>
<tr>
<td>Max</td>
<td>元素必须是一个数字，其值必须小于或等于指定的最大值</td>
<td></td>
</tr>
<tr>
<td>Min</td>
<td>元素必须是一个数字，其值必须大于或等于指定的最小值</td>
<td></td>
</tr>
<tr>
<td>AssertFalse</td>
<td>元素的值必须为false</td>
<td></td>
</tr>
<tr>
<td>AssertTrue</td>
<td>元素的值必须为true</td>
<td></td>
</tr>
<tr>
<td>Digits</td>
<td>元素必须是可接受范围内的数字</td>
<td></td>
</tr>
<tr>
<td>NegativeOrZero</td>
<td>元素必须为严格的负数（即0视为无效值）</td>
<td></td>
</tr>
<tr>
<td>NotBlank</td>
<td>删除任何前导或尾随空格后，检查字符序列是否不为空</td>
<td></td>
</tr>
<tr>
<td>NotEmpty</td>
<td>元素必须不为null且不为empty</td>
<td></td>
</tr>
<tr>
<td>NotNull</td>
<td>元素必须不为null</td>
<td></td>
</tr>
<tr>
<td>Null</td>
<td>元素必须为null</td>
<td></td>
</tr>
<tr>
<td>PositiveOrZero</td>
<td>元素必须为正数或0</td>
<td></td>
</tr>
<tr>
<td>Positive</td>
<td>元素必须为严格的正数（即0视为无效值）</td>
<td></td>
</tr>
<tr>
<td>Size</td>
<td>元素大小必须在指定的边界（包括在内）之间。</td>
<td></td>
</tr>
<tr>
<td>Future</td>
<td>元素必须是将来的瞬间，日期或时间</td>
<td></td>
</tr>
<tr>
<td>FutureOrPresent</td>
<td>元素必须是当前或将来的瞬间，日期或时间</td>
<td></td>
</tr>
<tr>
<td>Past</td>
<td>元素必须是过去的瞬间，日期或时间</td>
<td></td>
</tr>
<tr>
<td>PastOrPresent</td>
<td>元素必须是过去或现在的瞬间，日期或时间</td>
<td></td>
</tr>
</tbody>
</table>
<h2 id="2hibernate-validator编程式校验">2、Hibernate Validator编程式校验</h2>
<ul>
<li>SpringBoot</li>
</ul>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-xml" data-lang="xml"><span class="nt">&lt;dependency&gt;</span>
  <span class="nt">&lt;groupId&gt;</span>org.springframework.boot<span class="nt">&lt;/groupId&gt;</span>
  <span class="nt">&lt;artifactId&gt;</span>spring-boot-starter-validation<span class="nt">&lt;/artifactId&gt;</span>
<span class="nt">&lt;/dependency&gt;</span>
</code></pre></td></tr></table>
</div>
</div><ul>
<li>直接导入</li>
</ul>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt"> 1
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-xml" data-lang="xml"><span class="nt">&lt;dependency&gt;</span>
    <span class="nt">&lt;groupId&gt;</span>javax.validation<span class="nt">&lt;/groupId&gt;</span>
    <span class="nt">&lt;artifactId&gt;</span>validation-api<span class="nt">&lt;/artifactId&gt;</span>
    <span class="nt">&lt;version&gt;</span>2.0.0.Final<span class="nt">&lt;/version&gt;</span>
<span class="nt">&lt;/dependency&gt;</span>
<span class="nt">&lt;dependency&gt;</span>
  <span class="nt">&lt;groupId&gt;</span>org.hibernate.validator<span class="nt">&lt;/groupId&gt;</span>
  <span class="nt">&lt;artifactId&gt;</span>hibernate-validator<span class="nt">&lt;/artifactId&gt;</span>
  <span class="nt">&lt;version&gt;</span>6.1.5.Final<span class="nt">&lt;/version&gt;</span>
<span class="nt">&lt;/dependency&gt;</span>
<span class="nt">&lt;dependency&gt;</span>
</code></pre></td></tr></table>
</div>
</div><h3 id="21普通对象校验">2.1、普通对象校验</h3>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">User</span> <span class="o">{</span>

    <span class="nd">@NotNull</span>
    <span class="kd">private</span> <span class="n">String</span> <span class="n">name</span><span class="o">;</span>

    <span class="nd">@Min</span><span class="o">(</span><span class="n">value</span><span class="o">=</span><span class="s">&#34;1&#34;</span><span class="o">)</span>
    <span class="kd">private</span> <span class="n">String</span> <span class="n">age</span><span class="o">;</span>

    <span class="c1">//...
</span><span class="c1"></span><span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-JAVA" data-lang="JAVA"><span class="n">ValidatorFactory</span> <span class="n">factory</span> <span class="o">=</span> <span class="n">Validation</span><span class="o">.</span><span class="na">buildDefaultValidatorFactory</span><span class="o">();</span>
<span class="n">validator</span> <span class="o">=</span> <span class="n">factory</span><span class="o">.</span><span class="na">getValidator</span><span class="o">();</span>

<span class="n">Set</span><span class="o">&lt;</span><span class="n">ConstraintViolation</span><span class="o">&lt;</span><span class="n">Car</span><span class="o">&gt;&gt;</span> <span class="n">constraintViolations</span> <span class="o">=</span> <span class="n">validator</span><span class="o">.</span><span class="na">validate</span><span class="o">(</span> <span class="n">department</span> <span class="o">);</span>

<span class="n">assertEquals</span><span class="o">(</span> <span class="n">1</span><span class="o">,</span> <span class="n">constraintViolations</span><span class="o">.</span><span class="na">size</span><span class="o">()</span> <span class="o">);</span>
<span class="n">assertEquals</span><span class="o">(</span> <span class="s">&#34;must not be null&#34;</span><span class="o">,</span> <span class="n">constraintViolations</span><span class="o">.</span><span class="na">iterator</span><span class="o">().</span><span class="na">next</span><span class="o">().</span><span class="na">getMessage</span><span class="o">()</span> <span class="o">);</span>
</code></pre></td></tr></table>
</div>
</div><p>Validation类是Bean Validation的入口点，buildDefaultValidatorFactory()方法基于默认的Bean Validation提供程序构建并返回ValidatorFactory实例。使用默认验证提供程序解析程序逻辑解析提供程序列表。代码上等同于Validation.byDefaultProvider().configure().buildValidatorFactory()。</p>
<p>之后调用该ValidatorFactory.getValidator()返回一个校验器实例，使用这个校验器的validate方法对目标对象的属性进行校验，返回一个ConstraintViolation集合。ConstraintViolation用于描述约束违规。 此对象公开约束违规上下文以及描述违规的消息。</p>
<h3 id="22分组校验">2.2、分组校验</h3>
<p>首先需要在constraint注解上指定groups属性，这个属性是一个class对象数组，再调用javax.validation.Validator接口的validate方法的时候将第二个参数groups传入class数组元素之一就可以针对这个这个group的校验规则生效。</p>
<h2 id="handlermethodargumentresolver">HandlerMethodArgumentResolver</h2>
<blockquote>
<p>在04_HandlerAdaptor那一章节中我们已经讲过参数解析器了，在参数解析过程中，SpringMVC会对参数进行校验。</p>
</blockquote>
<p>我们这里以<code>RequestResponseBodyMethodProcessor</code>来举例，该类实现了<code>HandlerMethodArgumentResolver</code>接口，用于处理@RequestBody标记的参数类型。</p>
<p><img
        class="lazyload"
        src="/svg/loading.min.svg"
        data-src="https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-25/16:25:12-image-20200725145826050.png"
        data-srcset="https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-25/16:25:12-image-20200725145826050.png, https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-25/16:25:12-image-20200725145826050.png 1.5x, https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-25/16:25:12-image-20200725145826050.png 2x"
        data-sizes="auto"
        alt="https://gitee.com/scemsjyd/static_pic/raw/master/uPic/2020-07-25/16:25:12-image-20200725145826050.png"
        title="image-20200725145826050" /></p>
<h3 id="validateifapplicable"><strong>validateIfApplicable</strong></h3>
<p>该方法便是用于参数的校验，具体逻辑如下：</p>
<p><img
        class="lazyload"
        src="/svg/loading.min.svg"
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        class="lazyload"
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<ul>
<li>
<h2 id="validationautoconfiguration">ValidationAutoConfiguration</h2>
</li>
</ul>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
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</span><span class="lnt">5
</span><span class="lnt">6
</span><span class="lnt">7
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="nd">@RestController</span>
<span class="nd">@Validated</span>
<span class="kd">public</span> <span class="kd">class</span> <span class="nc">TestController</span> <span class="o">{</span>
    <span class="nd">@RequestMapping</span><span class="o">(</span><span class="s">&#34;/test&#34;</span><span class="o">)</span>
    <span class="kd">public</span> <span class="n">String</span> <span class="nf">test</span><span class="o">(</span><span class="nd">@RequestParam</span><span class="o">(</span><span class="s">&#34;age&#34;</span><span class="o">)</span> <span class="nd">@Max</span><span class="o">(</span><span class="n">200</span><span class="o">)</span> <span class="n">Integer</span> <span class="n">age</span><span class="o">)</span> <span class="o">{</span>
        <span class="k">return</span> <span class="n">String</span><span class="o">.</span><span class="na">format</span><span class="o">(</span><span class="s">&#34;age = %s&#34;</span><span class="o">,</span> <span class="n">age</span><span class="o">);</span>
    <span class="o">}</span>
<span class="o">}</span>
</code></pre></td></tr></table>
</div>
</div><p>spring驱动类：ValidationAutoConfiguration MethodValidationPostProcessor</p>
<p>校验器</p>
<p><a href="https://blog.csdn.net/roberts939299/article/details/73730410" target="_blank" rel="noopener noreffer">https://blog.csdn.net/roberts939299/article/details/73730410</a></p>
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